earthquakes and volcanoes

Question 1

is the ground beneath us firm and solid?

Answer 1

no, earthquakes and volcanoes make it shake and crack

Question 2

what evidence shows that the rocks on the mountains were once on the sea?

Answer 2

there were fossil seashells on top of mountains

Question 3

what was used to measure the power of an earthquake?

Answer 3

a seismograph

Question 4

what are the three sections that make up the earth?

Answer 4

crust: between 6 - 40 kilometers thick and consists of solid rock

mantle: made of magma
core: hot ball of iron and nickel

Question 5

how many volcanoes erupt each year?

Answer 5

between 50 and 70 erupt each year

Question 6

what special about the ‘ring of fire’?

Answer 6

three-quarters of the world’s volcanoes are in the ‘ring of fire’ in the pacific ocean

Question 7

where do most of iceland’s power come from?

Answer 7

it comes from hot rocks under the ground

Question 8

how do earthquakes happen?

Answer 8

two plates move apart or grind together

Question 9

what happens when a volcano erupts

Answer 9

hot rocks and gases are forced to the surface